The main reasons why the CNC lathe guide bearing temperature is too high are as follows:

1. The contact points on the bearing surface of CNC lathes are small and the contact surface is insufficient, resulting in the inability to effectively disperse heat, causing the bearing temperature to rise. This is usually because the bearing surface is not designed or manufactured to meet the equipment specifications.

2. The increase in the clearance of the guide bearing of the CNC lathe is much larger than the clearance required by the design, causing the lubricating oil to be unable to form an effective oil wedge when entering the bearing tile surface, thus causing poor lubrication. Poor lubrication will increase the friction of the bearing, thereby generating more heat and causing the bearing temperature to rise.

3. When the CNC lathe is running continuously, the temperature of the cooling water may exceed the specified range, or the ceramic tile temperature and oil temperature may exceed the allowable range, which will also cause the bearing temperature to rise.

In order to reduce the temperature of CNC lathe guide bearings, the following measures can be taken:

1. Check and adjust the contact points and contact surfaces on the bearing surface of the CNC lathe to ensure that they meet the equipment specifications to improve the heat dissipation effect.

2. Check and adjust the clearance of the CNC lathe guide bearing to ensure that it is within the design requirements to ensure that the lubricating oil can form an effective oil wedge and provide good lubrication conditions.

3. The CNC lathe controls the cooling water temperature and oil temperature within the specified range to avoid excessively high or low temperatures having adverse effects on the bearings.

In addition, CNC lathes should be maintained and maintained regularly, the wear of bearings should be checked, and severely worn bearings should be replaced in time to ensure the normal operation of CNC lathes.

Please note that these are just some possible causes and solutions for CNC lathes. The specific situation may vary depending on machine tool model, working environment, usage conditions and other factors. Therefore, in actual operation, analysis and processing should be carried out according to specific circumstances. If necessary, it is recommended to consult professional technicians or machine tool manufacturers for more accurate solutions.